Explain why your hair sticks to a plastic (polyethylene) comb.
Answer:
Due to the accumulation of static charges/due to static electricity
The specific heat of ethanol is 2.44 J/g ֯C. How many kJ of energy are required to heat 50.0 grams of ethanol from -20 ֯C to 68 ֯C? (heat equation)
Answer:
Heat energy required (Q) = 10.736 KJ
Explanation:
Given:
Specific heat of ethanol (C) = 2.44 J/g °C
Mass of ethanol (M) = 50 gram
Initial temperature (T1) = -20°C
Final temperature (T1) = 68°C
Find:
Heat energy required (Q) = ?
Computation:
Change in temperature (ΔT) = 68°C - (-20°C)
Change in temperature (ΔT) = 88°C
Heat energy required (Q) = mC(ΔT)
Heat energy required (Q) = (50)(2.44)(88)
Heat energy required (Q) = 10,736 J
Heat energy required (Q) = 10.736 KJ
Bleach is a 0.750 M solution of sodium hypochlorite. What volume, in litres, would contain 120.3 g of sodium hypochlorite?
Answer:
2.15 L
Explanation:
M(NaOCl) = 23.0 + 16.0 + 35.5 = 74.5 g/mol
120.3 g *1 mol/74.5 g = 1.615 mol NaOCl
0.750 M = 0.750 mol/L
1.615 mol * 1L/0.750 mol = 2.15 L
What is the difference between metals, nonmetals and metalloids?
Metals are solids, non metals are gasses and metalloids are in between metals and non metals. Also, metals have there atoms all close and packed, non metals have there atoms far apart, and metalloids have there atoms either close or far apart. Metals are separated form the non metals in the periodic table.
What is the valency of oxygen??????
Answer:
the valency of oxygen is -2
Answer:
-2
Explanation:
The valency of oxygen is -2. This means oxygen needs to gain or share two electrons for stability.
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How many grams of krypton gas would occupy 1.34L at STP?
Answer:
5.01 g
Explanation:
At STP means at standard temperature and pressure, this is when the pressure is at 1 atm and temperature is at 273 K. At this point, the volume is 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm
The molar mass of krypton as gotten from the periodic table is 83.8 g/mol. At STP, an ideal gas occupies 22.4 L/mol. Therefore, the grams that 1.3 L of krypton gas would occupy is:
[tex]mass=\frac{1mol}{22.4L} *\frac{83.8g}{1mol} *1.34L=5.01g[/tex]
Which of these compounds is the odd
one out? *
(1 Point)
H2O
NaBr
NH₃
HCI
Que tienen en comun el chocolate, las papas fritas y la hamburguesa?
Que tienen en comun los vegetales, el huevo y el pan?
Answer: todos terminan en tu boca
Explanation:
Hahaha
Which set of characteristics would you use to classify this planet as an inner or terrestrial planet?
Answer:
Dense and solid. And located near a star.
Explanation:
The set of characteristics that you would use to classify this planet as an inner or terrestrial planet is Dense and solid.
What are the characteristics used to classify terrestrial planets?Terrestrial planets are Earth-like planets made of rocks or metals with a hard floor. Terrestrial planets even have a molten heavy-steel middle, few moons, and topological capabilities which include valleys, volcanoes, and craters.
Which set of traits describe the internal planets?
All are solid, dense, and rocky. not one of the internal planets has rings. compared to the outer planets, the internal planets are small. they have shorter orbits across the sun and they spin more slowly.
Learn more about Planets at https://brainly.com/question/1286910
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Calculate the amount of energy required to boil 25.00 g of mercury.
Answer:
C. 7.4 kJ
Explanation:
Let assume that Mercury is at room temperature (25 °C). The energy required to boil the sample of mercury is the sum of sensible and latent heats. Mercury has a fussion and boiling points of -38.83 °C and 356.7 °C, respectively, and a specific heat of [tex]138\,\frac{J}{kg\cdot ^{\circ}C}[/tex]. Then:
[tex]Q = (25\,g)\cdot \left[\left(0.138\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (356.7^{\circ}C - 25^{\circ}C) + 296\,\frac{J}{g} \right][/tex]
[tex]Q = 8544.365\,J[/tex]
The option that offers the best approximation to the result is C.
24-Complete the following sentence:
Osmosis is a process during the _____ moves to balance the concentrations on both sides of a membrane.
the choices:
a: solute
b: solvent
c: substrate
d: soda cracker
Answer:
B. Solvent
Explanation:
In osmosis, water always moves from low solute concentration to high solute concentration. SOLUTE NEVER MOVES AS IT CANNOT PASS THE SELECTIVELY PERMEABLE MEMBRANE. alot of caps but need to stress this concept cuz otherwise this concept gets very confusing
A 60.0 kg object is moving east at 8.00 m/s, and then slows down to 4.00 m/s. How much work was done?
–1,440 J
–480 J
1,440 J
2,880 J
Answer:
A
-1440J
Explanation:
Hello,
This question requires us to calculate the work done on a object to move it from point A to point B
Data
Mass = 60kg
Initial velocity (V1) = 8.0m/s
Final velocity (V2) = 4.0m/s
Workdone on an object is equal to force applied on the object to move it through a particular distance.
Work done = force × distance
Force (F) = mass × acceleration
Distance = s
F = Ma
Work done = M× a × s
But a = velocity (v) / time (t)
Work done = mvs / t
But velocity = distance/ time
Work done = mv × v/
Work done = mv²
Work done = ½mv²
Workdone = ½M(V2² - V1²)
Workdone = ½ × 60 (4² - 8²)
Work done = 30 × (16 - 64)
Workdone = 30 × (-48)
Work done = -1440J
Work done = -1.44kJ
The workdone on the object is equal to -1.44kJ
Answer:
–1,440 J
Explanation:
a on edge 2021